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2006 ; 134
(6
): 1129-40
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Epidemic influenza and vitamin D
#MMPMID16959053
Cannell JJ
; Vieth R
; Umhau JC
; Holick MF
; Grant WB
; Madronich S
; Garland CF
; Giovannucci E
Epidemiol Infect
2006[Dec]; 134
(6
): 1129-40
PMID16959053
show ga
In 1981, R. Edgar Hope-Simpson proposed that a 'seasonal stimulus' intimately
associated with solar radiation explained the remarkable seasonality of epidemic
influenza. Solar radiation triggers robust seasonal vitamin D production in the
skin; vitamin D deficiency is common in the winter, and activated vitamin D,
1,25(OH)2D, a steroid hormone, has profound effects on human immunity. 1,25(OH)2D
acts as an immune system modulator, preventing excessive expression of
inflammatory cytokines and increasing the 'oxidative burst' potential of
macrophages. Perhaps most importantly, it dramatically stimulates the expression
of potent anti-microbial peptides, which exist in neutrophils, monocytes, natural
killer cells, and in epithelial cells lining the respiratory tract where they
play a major role in protecting the lung from infection. Volunteers inoculated
with live attenuated influenza virus are more likely to develop fever and
serological evidence of an immune response in the winter. Vitamin D deficiency
predisposes children to respiratory infections. Ultraviolet radiation (either
from artificial sources or from sunlight) reduces the incidence of viral
respiratory infections, as does cod liver oil (which contains vitamin D). An
interventional study showed that vitamin D reduces the incidence of respiratory
infections in children. We conclude that vitamin D, or lack of it, may be
Hope-Simpson's 'seasonal stimulus'.
|Humans
[MESH]
|Influenza Vaccines/therapeutic use
[MESH]
|Influenza, Human/*epidemiology/prevention & control
[MESH]
|Ultraviolet Therapy/methods
[MESH]
|Vitamin D Deficiency/*epidemiology/physiopathology
[MESH]